EP1198094B1 - Procédé et dispositif pour détecter la topologie de bus d'un système de bus - Google Patents

Procédé et dispositif pour détecter la topologie de bus d'un système de bus Download PDF

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Publication number
EP1198094B1
EP1198094B1 EP01122225A EP01122225A EP1198094B1 EP 1198094 B1 EP1198094 B1 EP 1198094B1 EP 01122225 A EP01122225 A EP 01122225A EP 01122225 A EP01122225 A EP 01122225A EP 1198094 B1 EP1198094 B1 EP 1198094B1
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EP
European Patent Office
Prior art keywords
bus
signal
measurement
segment
topology
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01122225A
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German (de)
English (en)
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EP1198094A3 (fr
EP1198094A2 (fr
Inventor
Gilles Brendle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
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Siemens AG
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Publication of EP1198094A3 publication Critical patent/EP1198094A3/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/40—Bus networks
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40221—Profibus

Definitions

  • the invention relates to a method for detection the bus topology of a bus system with at least one bus segment, a number of connected to a bus line Bus participants has. It continues to refer to a device for carrying out the method.
  • a bus system or field bus covers within a complex Network with a number of bus segments a variety of bus subscribers in the form of field devices, such. Eg sensors, Actuators, Programmable Logic Controllers and Control stations.
  • the so-called PROFIBUS DP network usually up to 127 bus subscribers, which subscriber addresses from 0 to 126 can be assigned. It can be up to be connected to 32 network components as bus subscribers.
  • the individual bus segments are connected by means of line drivers or so-called repeaters, which at the same time serve to realize branching in the fieldbus or network.
  • the topology of at least the or each bus segment of the bus system ie the bus segment topology should be known, which is given by the order and the relative distance of the bus participants and thus by their arrangement on this bus segment.
  • the network topology also takes into account the interconnection of the individual bus segments with each other.
  • the document US5434861 discloses a common method for determining the Bus topology based on the maturity of the query / response signal.
  • the invention is therefore based on the object, a particularly suitable method for determining the topology of a bus system indicate that a particularly reliable determination the arrangement of bus subscribers on one or each bus segment Even a complex bus system allows. Furthermore should a particularly suitable for carrying out the method Device can be specified.
  • the or each bus participant is first of all of the bus segment via the bus line a request signal transmitted for sending a response signal.
  • a request signal transmitted for sending a response signal.
  • the response signal becomes a measurement signal sent over the bus, that of the answering one Bus participant is reflected.
  • the reflection measurement is taken from the period between the transmission of the measurement signal and the arrival of the reflection signal from the responding bus subscriber whose relative Position along the bus line and thus within the bus segment certainly.
  • the invention is based on the knowledge that at a Bus subscribers with switchable transmitter the transmitter-receiver combination with deactivated transmitter on the one hand in such a way is high impedance that this is no transmission disturbance on the Bus line causes, on the other hand, however, with activated Transmitter is low impedance.
  • a sending bus participant decreases while its internal resistance from infinity ( ⁇ ) to about 40 ⁇ with the consequence of a local change of the characteristic impedance the bus line of the respective bus segment, at the this sending bus station is connected.
  • ⁇ infinity
  • this pulse or this signal is reflected by the transmitting bus subscriber.
  • This reflection in turn can according to the principle of reflection measurement be detected.
  • One according to the principle of reflection measurement working method for locating a Short circuit or a cable break in a two-wire bus system is z. B. from DE 197 26 539 A1.
  • a or each bus participant first a request signal for Send, preferably in the form of a measurement telegram, and then sent a measurement signal, then from the or each another bus participant is reflected during this responds to the measurement telegram.
  • the measurement telegram is suitably from a below referred to as a measuring initiator sent active bus participant of the bus system.
  • the Measuring signal is expediently from a through a measuring circuit extended to reflection measurement to a diagnostic repeater Repeater sent as a passive bus participant for connecting at least two bus segments of the bus system serves. From the time between the transmission of the measurement signal and the arrival of the reflection signal at the diagnostic repeater will be the distance between this and the respective one Bus participants - and thus its relative position within of the bus segment - determined.
  • the removal of or of each bus user from the diagnostic repeater in a topology table deposited is advantageously based on the topology table determined between which bus participants the Fault or the line fault is.
  • the method according to the invention and the device according to the invention are therefore particularly suitable for fieldbus systems, in particular for the so-called PROFIBUS DP network.
  • a bus segment B n is a line segment or section of a bus line 2, to which up to 32 network components or subscribers T n can be connected.
  • the line length of the respective bus segment B n is - depending on the baud rate of data transmission - limited.
  • bus segments B n are connected by means of line drivers or line amplifiers, so-called repeaters, these repeaters also simultaneously serving to realize branches in the network.
  • a repeater is a diagnostic repeater 3 which, in addition to the repeater function, also has a measuring circuit 4 for reflection measurement for at least one bus segment B 1 , B 2 .
  • the diagnostic repeater 3 has two measuring circuits or devices 4 with terminating resistors (not shown).
  • the measuring means 4 are connected to the bus line 2 and a respective bus segment B 1 and B 2 associated.
  • Each bus segment comprises a number of bus subscribers T n connected to the respective bus line 2, wherein in the exemplary embodiment only the bus segment B 1 is occupied by bus subscribers T11 to T13.
  • the bus subscriber T13 has a terminating resistor 5 connected thereto.
  • the bus segment B 1 has a measuring initiator 6 as the active bus subscriber T12, while the diagnostic repeater 3 is a passive bus subscriber T10.
  • the topology determination of the bus system 1 is carried out by means of a reflection measurement. This exploits the fact that a transmitting bus subscriber T n on the bus segment B 1 or on the bus line 2 behaves in the same way as an impurity F symbolized by the arrow. Namely, a transmitting bus subscriber T n reduces its internal resistance when transmitting ⁇ to approximately 40 ⁇ , If a measuring pulse is now applied to the bus line 2, then this measuring pulse is reflected by a transmitting bus subscriber T n .
  • a bus subscriber T n is caused to transmit by being addressed by the measuring initiator 6 with a request signal FS and thus caused to transmit.
  • the diagnostic repeater 3 While a bus subscriber T n responds to a request signal FS (SRD measurement telegram) with a response signal AS (SR measurement telegram), the diagnostic repeater 3 sends a measurement pulse or a measurement signal MS, which is reflected by the transmitting subscriber T n . From the period between the transmission of the measuring pulse MS and the arrival of the reflection, ie a reflection signal RS from the responding bus subscriber T n , the measuring device 4 of the diagnostic repeater 3 determines the relative position of this bus subscriber T n on the bus line 2 and thus within the bus segment B 1 . The distance of the respective bus subscriber T n from the diagnostic repeater 3 is determined from the transit time divided by the 2-fold cable or cable runtime.
  • the removal of an impurity which is symbolized in FIG. 1 by the arrow F on the bus line 2 of the bus segment B 1 , is determined following the determination of the bus topology, it can be ascertained by means of the topology table 7 between which bus subscribers T n this fault location or the line fault F is.
  • the exact distance l F of the fault F from the diagnostic repeater 2 is also determined by means of the measuring device 4 and in turn preferably according to the principle of reflection measurement.
  • the diagnostic repeater 3 For detecting defects or line faults F on the bus line 5, the diagnostic repeater 3 sends an initiating measurement signal into the bus line 2. This initiating measurement signal is reflected due to the change of the characteristic impedance of the bus line 2 at the fault F and detected by the measuring device 4 as a reflection or reflection signal , From the time difference between the start time of the diagnostic repeater 3 initiated measurement signal and the arrival of the reflection signal to the measuring device 4, the distance l F of the fault or the line fault F is determined by the diagnostic repeater 3. For this purpose, the recorded transit time is again divided by the 2-fold cable or cable running time, which is for example 5 ns / m.
  • the initiating measuring signal is preferably a measuring telegram, i.e. a data signal forming the data telegram.
  • a realized passive reflection measurement has opposite an active reflection measurement the main advantage of non-reactive line diagnostics, as no separate Test signal or a separate measuring pulse during the current Bus operation must be given to the bus line 2. Rather, the actual useful signal is used to line errors or to detect impurities F.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Claims (7)

  1. Procédé de détermination de la topologie d'un système de bus (1) ayant au moins un segment de bus (B1), qui comporte un certain nombre d'utilisateurs de bus (Tn) raccordés à une ligne de bus (2),
    dans lequel on transmet par l'intermédiaire de la ligne de bus (2) à l'utilisateur ou à chaque utilisateur (Tn) du segment de bus (B1) un signal de demande (FS) pour l'émission d'un signal de réponse (AS),
    dans lequel, pendant la transmission du signal de - réponse (AS), on envoie par l'intermédiaire de la ligne de bus (2) un signal de mesure (MS) qui est réfléchi par l'utilisateur de bus qui répond (Tn), et
    dans lequel, à partir de l'intervalle de temps entre l'émission du signal de mesure (MS) et l'arrivée du signal réfléchi (RS), on détermine la position de l'utilisateur de bus qui répond (Tn) à l'intérieur du segment de bus (B1).
  2. Procédé selon la revendication 1, dans lequel on enregistre la position relative de l'utilisateur de bus qui répond (Tn) dans un tableau de topologie (7).
  3. Procédé selon la revendication 1 ou 2, dans lequel le signal de mesure (MS) est envoyé par un utilisateur de bus (T12) comportant un dispositif de mesure (4) pour la mesure de réflexion, la position de l'utilisateur de bus qui répond (Tn) étant déterminée par son éloignement (ln) par rapport au dispositif de mesure (4).
  4. Procédé selon la revendication 3, dans lequel on détermine à l'aide du tableau de topologie (7) l'emplacement d'un défaut de ligne (F), détecté au moyen du dispositif de mesure (4), entre deux utilisateurs de bus (Tn).
  5. Dispositif de détermination de la topologie d'un système de bus (1) ayant au moins un segment de bus (B1), qui comporte un certain nombre d'utilisateurs de bus (Tn) raccordés à une ligne de bus (2),
    comprenant un déclencheur de mesure (6) qui est raccordé à la ligne de bus (2) et qui transmet à l'utilisateur ou à chaque utilisateur (Tn) du segment de bus (B1) un signal de demande (FS) pour l'émission d'un signal de réponse (AS), et
    comprenant un dispositif de mesure (4) qui est raccordé à la ligne de bus (2) et qui, pendant la transmission du signal de réponse (AS), envoie un signal de mesure (MS) par l'intermédiaire de la ligne de bus (2) et détermine à partir de l'intervalle de temps entre l'émission du signal de mesure (MS) et l'arrivée d'un signal réfléchi (RS), l'éloignement par rapport à l'utilisateur de bus qui répond (Tn).
  6. Dispositif selon la revendication 5, dans lequel le dispositif de mesure (4) est intégré dans un répéteur de diagnostic (3), servant à relier au moins deux segments de bus (B1, B2), du système de bus (1).
  7. Dispositif selon la revendication 5 ou 6, avec déclencheur de mesure (6) intégré dans le répéteur de diagnostic (2).
EP01122225A 2000-09-29 2001-09-17 Procédé et dispositif pour détecter la topologie de bus d'un système de bus Expired - Lifetime EP1198094B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10048744A DE10048744B4 (de) 2000-09-29 2000-09-29 Verfahren und Vorrichtung zur Ermittlung der Bustopologie eines Bussystems
DE10048744 2000-09-29

Publications (3)

Publication Number Publication Date
EP1198094A2 EP1198094A2 (fr) 2002-04-17
EP1198094A3 EP1198094A3 (fr) 2004-12-15
EP1198094B1 true EP1198094B1 (fr) 2005-11-30

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EP01122225A Expired - Lifetime EP1198094B1 (fr) 2000-09-29 2001-09-17 Procédé et dispositif pour détecter la topologie de bus d'un système de bus

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EP (1) EP1198094B1 (fr)
AT (1) ATE311707T1 (fr)
DE (2) DE10048744B4 (fr)
ES (1) ES2252128T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004017670B4 (de) * 2004-04-10 2006-02-16 Bbt Thermotechnik Gmbh Verfahren zur Erkennung eines Bussystems
CN108370630B (zh) 2015-10-16 2020-06-16 飞利浦照明控股有限公司 经由挑战-响应-定时来调试负荷设备
DE102019212414A1 (de) * 2019-08-20 2021-02-25 Conti Temic Microelectronic Gmbh Verfahren zur Positionserkennung eines Busteilnehmers
DE102020205671A1 (de) 2020-05-05 2021-11-11 Geze Gmbh Konfiguration eines Bussystems

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5434861A (en) * 1989-02-02 1995-07-18 Pritty; David Deterministic timed bus access method
DE4433116B4 (de) * 1994-09-16 2004-07-15 Siemens Ag Verfahren zum selektiven Aufrufen von Netzelementen
DE19710971A1 (de) * 1997-03-17 1998-09-24 Siemens Ag Verfahren zur Bestimmung der Laufzeit eines Telegramms sowie Teilnehmer zur Durchführung des Verfahrens
DE19726539C2 (de) * 1997-06-23 2001-09-27 Daimler Chrysler Ag Verfahren und Schaltungsanordnung zur Lokalisierung eines Kurzschluß oder Kabelbruchs in einem Bus-System

Also Published As

Publication number Publication date
ES2252128T3 (es) 2006-05-16
DE10048744A1 (de) 2002-04-18
DE50108230D1 (de) 2006-01-05
EP1198094A3 (fr) 2004-12-15
DE10048744B4 (de) 2004-11-18
EP1198094A2 (fr) 2002-04-17
ATE311707T1 (de) 2005-12-15

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